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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b83cea67d2b9a1ac2ea9d4ba82061dc3342496f554bb116246edc0b89fa6830f' 
  AND token = 'BfnAC4wtn5bpAD4jk+IU9vEBM1DRnct5sSoD9ogVtyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}