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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71f21c8e011c97152471011773c1316526c5fcfe52c935145242b7adad4bb041' 
  AND token = 'OR9K6jyTYUMVL76CGUrvokJtbMzcNE1o6Uoa3nHiH1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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