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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bda32ed564f3e22dbaffde69c5e0b84d0422b1d6d179e9eeffd66d8e2850a469' 
  AND token = 'y1oiOUEvneQwb61vQq5FdQ4vQbbTEPW6/xnaSn9Y/wA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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