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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26445fb98e9c4d70c61d12adc19b12d8fe93318babfe705cbed2ff74d97c81ad' 
  AND token = 'NEX99ZBXfInH1/j0/ipB3HzpBrNjvQqF2WEHup50evo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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