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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb580a4c76c7534c32cb44a28431893113d118c30ef0cadb001ec7d53007ba8a' 
  AND token = '3hCUkktJ7UfRVVdeZerESc6uucqDZiw6BE+YqkcOv/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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