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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd47719c6ccfc7bf24eaae44f434d93ea4b91e17dfca95d7ca46d7cffe4ede95f' 
  AND token = '4SEByq1n4K9N/IflL93PN9UE6ULkL3k4j9ZzE1M3EcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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