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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f5e05fed521b977d53cdb0df9381afc42c616649b1297039b366855a09a4420' 
  AND token = 'HC+1eiOyXk5EOQ4OAWXKvMvMlK4BL6ap7Fuvu/g5144=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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