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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1efd5ace6c0cc9011abccc1ffc45cb481b4d0be4487ad2eef804f45726c102d' 
  AND token = 'BYjX5XVp4cRWP6lSR+OsJ6IMIPJ18oKGdjoADZGiWys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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