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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd9629db48e4e2cd1f4d26a1943465e4caf7d5f98ac2249a25f93b647c7ed747' 
  AND token = 'zy2k+af9cLow/Z31FWkhwAkQCohOScDaKCIauh32K/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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