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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05f41e46cbdf551a3e590413d560bb8fbf117339b19c89be9367be65dcae8cf3' 
  AND token = '7BvMBa1s/+fGkggxL141n/WcwDhEfw4xdSiH0Gp9anc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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