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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bfa3ccd73664d287c96c0c5a005f7d2bfae923475571a772c5c080181dae0d1' 
  AND token = 'Xz7F8+8CCFb/2kIwTxpryT4KZxrpqsC1WRRE8iv012M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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