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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc20f86a81868b54c4cd3ffeaadeaf947c97069cca90e45f4bcfc7a6e64ea374' 
  AND token = 'Z8evW03XogXEmoFfN777QLDQ9DzAH3bErezaSdOBxe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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