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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41cfa0c1da2235dba568cc230817a71d3cd73913e52bb42b9c2b0de2a9cc3804' 
  AND token = '1HXW/DoZEMhAP34cMpY0aqhpWaBf845V1uHPT5zLsoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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