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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9591336e69ef40d16623d5ea27768c3f883b9e39452036037de0bf26e92d033b' 
  AND token = 'Hkp5lIs0mpHie5RLBYneUrAUWqumD1NrC7WzStX7+O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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