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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7b6388263d92e28b917e4dfd2679406ed1c3e57421e944ed420ddf27fbc0f53' 
  AND token = 'T+3W13a6RK+OlKVrDgA0B60poxBgXcMcaKWHM05f2+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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