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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8a7f84b12577bb6ec7e1daae5de774ed8f1f2b01ad79676b3e5cd96f395ed91' 
  AND token = 'tqiRA6XFP4k7BLIQk0nfrEKHivRt+SCaCeU1nWJVKFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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