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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '112cf629d3442288b064e51b5eaf96fbd58adaa855c25cbc94af426c07a8125e' 
  AND token = 'fB8onPyHd3eK5e3PBdEbGq18fX/veLzxXfpFEKOAfEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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