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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67ca9a7778a52b85d6f63c53f4c7e58cd57250df8e4dfc3a6dd1e426a57d9deb' 
  AND token = 'udPwgDMEh8gixLwFG9wWX/8mz7+Enhy+gVyxpI1ZEwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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