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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c6eb68244e8eb54182370a562e46dfdc4e2620c0e0d32bdc2ab4dc20bdb010' 
  AND token = 'znqzq8CA2qEpLV6HWVtVL58d4x5uPYamwnswf3p2yJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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