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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '018347aeada327da35af92e4437b83de4e1f4e5acece53ebc6ee94354926d620' 
  AND token = '+926a1Sw256XqPrVgbEGEpaEfRnwQy+7fRiTgpwFQPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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