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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffd136a6b3d54e9b7145c198bf99083c71e757af8dd0f6e593538fc6a20752c3' 
  AND token = 'RErh+7aGUTJiI5tbfe9QE6PDvTse3IqWAhLHeyq5xW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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