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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '790c85f93bcf8dd1691a0e7d850914394bca1e65d7ca24e303f6bdc86ba22748' 
  AND token = '6AHeujUXodNtaY5roGhJ5cMNxMoYwglvHVNhglf70cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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