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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f22b989d377d42f8ff678c25aa808cc54ff9adf6c5bdcbc3482957aff6512f94' 
  AND token = 'Qbu6ITXRhvNq3x4pWWpUPHVqw5f2QRL3TiO/4iv6jlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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