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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e7aa5dba3e42f1790b389409f82d2f183ef2380edbcc97ccab7c1e14da65c38' 
  AND token = 'SdBnf6CDZG1Zry+6869ucP1qelE6MH+7fFW31LQnRD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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