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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca39132de4e9f1c88c68298b3081da68aed450d255dfb3968535d32f7a8a94da' 
  AND token = 'veAjb73CdgFyXtR6ctGaio2dtlO5z/qICeQRGEocqBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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