SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfdaf8360fe2e30c425551ae99d46e9661a31fe8f8c754ee7b238de50ff64795' 
  AND token = 'ZNvqjtKPzGl/wTtsaKbfgjNVr31mB1lNWY0hjBy27T8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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