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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '011fba91220ff4680875a4e7c9f6cc4d7c865558173aff3c3f65149107f25b21' 
  AND token = 'UcAALxfz6U8YR12uoCPOr4HohAjWWETZAqMSQ54sP44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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