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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '035893337c1cf14182a0212ae5f6e2a5c9362c44cc333abeb0419859a4109b41' 
  AND token = 'wmKyPQWya6v8bE0Q+u/Yx1Kmma/Qyk7o3k7dtBTo8A0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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