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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ee6bd5883b864573157c627f3661a519ded99ee42c7d9ccdabbf41cf44574d5' 
  AND token = 'bGsuUpJhWY0rNodRIf2Ez2IsalJjLpZHEj5Uim1SbC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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