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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0698833958a076580f17694a8aeb79955cd2b7881e31ae12cf587f7b5aaf4ae9' 
  AND token = 'heca2m0SL2bEoMT1ElA4cO4WmnbponoV7BJ48Hfz440=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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