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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bad07d0e28dcd7b536b8f0e2b3bad001e027da616048559056b1f1a966be7c1a' 
  AND token = 'zj2Gk7YtXtBZoY7h8F0NBhVpFvqKa2RpUIXaBOa/GZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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