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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b961b6ff30981b9a35857e1c40a349f58ea31a6e44720b686abfaddc2235800' 
  AND token = 'pXyHPtf4sHVjLXyxI8batVxsYcry2bC3jN5OlKiUILc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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