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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a16185e091122cb1eb91c332d9502e94ae851b21ac61624e9e30bf969e6addce' 
  AND token = 'Smw5F9N7rkWsMOb7qavKoJKnYjAmqQ9+n/C+T+n1tJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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