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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd39fac4c352c8cf88713f04b7d7cf3e4a3348804f16414a63409c28045dfeeb' 
  AND token = 'vsl7zQ8wIg0mYDiaIM2NXQX0vbkFTvZZYrm3UcuB+ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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