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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e84f8fd27fb28b348fd6d2c45d7294c10e2734e04b3cf855014efc98f442ccab' 
  AND token = 'ZLzoxC5qvFdhSFTP+6Tyw96Xqwcz5hWOiil7kwzPp/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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