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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a84925c96dc468b929eea51a0def1d25837c466d7a50e42d7bb154740f971f5' 
  AND token = 'u6jy3gFF7mUJ1L58cazzu7eqemcuW/Fx3TH7nF+lP0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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