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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7e2149d815b669af802e47ff8c3a4ee30498eb8f8faa4275b33122cc8f99ec4' 
  AND token = '47AFMmM2vuqbrwlcG7PK7Pj80pvWnNw/ZAsHrx1Y3Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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