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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f8937f4e31b5b8ec8dfc5ed09946b41fbb75426c753cc5026ae08da0325b5e2' 
  AND token = 'JCMVTXNeZzdXf45fo1wB8coHSS6TS1/I5XFiIe454kQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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