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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ae0e95ff37af01fd557dd4c8d9533a7b9b2406806b72f00e21550ddbc1b036b' 
  AND token = 'Fy5tJBhedNkYL7YAqqFpqpbc0W0S8b246QfDYwtN+F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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