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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76c00a9493418d136de2ece546e8c3945846ac25b527cf550eb8bb82887b31ed' 
  AND token = 'yn5q9EpaSvgEutaQv3QeEEHLXIMQ6cg5PIixTUB4yuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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