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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3205a7ea4ce6cf9c3566dcd94d9592bab0821be65542e71703b042f76d6437c' 
  AND token = 'Eaj4xePEQzzt233IoZiWUqPZALKaa996GuWHgXnBt+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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