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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ade497ed34979e00e717d7e1916996634ed5deaf1f1d7749a64fb58b6cb3015d' 
  AND token = 'DADhrAA8QFhxcFr7rUfFAwDQxvJCs1oYpMavmJsGUcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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