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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcc13b44ad3492e339ebb681072c1bbe5b35b103da57adf071041124eb46463f' 
  AND token = 'fN9+cQqIoS8XXeaALIHygGJ69cYRdA9VvzW70TkIoaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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