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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2502d17cc0c0a4b0b2d6e5d59d5f16e526b3c85830ba0d0991d9282fe86b9d97' 
  AND token = '1ASlCi0AScT/VzGPpLCYNvp/J0D1JjESo6kKmqytg9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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