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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70ff3a791337eaeaa7b8cf93826e0bb6f71686bb329d37760c9f528335e41b07' 
  AND token = 'RxKmPbMqDpTALgspzC2lYPop917EoZEWkX0tnjO0B9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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