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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbaecf4dae8aa5c34527f4a0836b8b4a3d498c6210309e5ba9b64328efb6015d' 
  AND token = 'bpCf5NXNy0AR6dEaoZ0nvNVM2GVjt7aJ/n+W978v53M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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