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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4aeb3ebecf984450173304270aa87776a90f692dbe521c5a02c3837befdd09d' 
  AND token = 'FaxgsekzP9/5yuZyyg4BD9x+IcXur6+w9Z6YLbBafa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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