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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6895cee721968b7f9ecc69833a8de3e25451446095808e42fe59531ee7ebe16' 
  AND token = 'fcu8q8Th7PapnbJm91gQt6KLvYfDk8iX7R5ChsNxrJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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