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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b47d5f9c42721cf993d037556406535526d07efa18e3e455b2041360081c3265' 
  AND token = 'gxPilzioIyAf5XYTHWgK7YeY+iE2226fIO6hqG7uRw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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