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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4bd5bf53ad0cc8c669df962e6726f1426bbd82f0894dff9bbaad0ee99f265c0' 
  AND token = 'vo/46LxDiWqvSyYpbktczdy03Mgmmj5l3WoVftP5voI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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