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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5afa1e21a2f4e2caecccddd0a999b6e664224f64a75f2b81365c931f7eb6bb6' 
  AND token = 'hG1KtOeNcZqIgVxsAawd1UP/242hYnWT6xWGF/9WEiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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