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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c035360f466c82c77e4f614dc9b2623968250d3332c6b6f4c7a701e230acf25f' 
  AND token = 'eZlMlRTg9yP5r1X3DxNOWF7tXhH3repaf0bNyJG7u0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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