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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '315d4126514b1ab7b5830210a57277a9389224d2f4cb44dce21127a11b66efa8' 
  AND token = 'L4ZL520CJa0rpiSIZbwXguYA71yOgFSsxJe3tD59PJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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