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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ac19d43033e3b89895f5900fbdaf0d35c655e981127cb00df6c5e2b28c281d5' 
  AND token = '27TOSCSFcL44dFf5Kdd+redHHGs0W5/vfzceDA4/4W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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