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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86fb02785b66c7f8739278e4afb50a526e11bec1e196f50535545ee70362f6ae' 
  AND token = 'L0QWSXil806h45fm1gMJ/i0vvs8+McRpI2WfUorzbh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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