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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de87051918cab29d77ca623d0d4bc5ced1c74d6d858285a139fc086825cdbbce' 
  AND token = '5n+WiADrAbzT3Tw5Yi+FJy/ytyAthYGeb6nD3TrLCO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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