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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '126fd6cd6507cf40d7bae960bc754a472ee0fc6fa913c831852e0c4c85bf440c' 
  AND token = '0Xl54Hy1F/bz7dxP3nI0Z+rfNRFIT8PWsjGMN5Q7Rs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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