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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fabaa2bae61b3fb255d9b5f7708b9394d088bb5b7f65c72b496e18aa3cea46bc' 
  AND token = '/5zq/3MuwsfKnN+rZOxX2KbLw0bgM3ZHC8aZ4BkidBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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