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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66bdd5edb31e576559facea5ef831a756ea5c2a32ac081e0e2597dbb47a8863e' 
  AND token = 'mjSBc8tGjOr33UJNfCDQExts6vjKcRAq91kRxMVkPrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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