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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '982e3caf49d54b219315c563f70cf5349e9cdd03dc9cc89858b139b0db654abc' 
  AND token = 'GOjXtI3jYID/omAzofmqXJkPP6IAwknjU0KTeuXUoiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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