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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59d37cb6be3b3c18d6f8c76b9f43af7d87c56a915a957829ed2e83706bcebb4b' 
  AND token = '88BagqarSVz7ZMBVV4KnHtekRE7cpqURy4QoM/nRRiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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