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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ade9a807fec106ceb1c4aa91d3e416458a194c48581e7b879007b8a25753cc54' 
  AND token = 'PWKLj8j9QwXBy9bj88/GpKlA9QcTwVTeHcnpN5LKZLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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