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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '733508cd809d1fe2d50cf731a4017acb1f8933a4e9302d69091b901929fd94f5' 
  AND token = '+6NReoylByfc9BGZmJmyc/n0sDQCFVuD8HtNn6y5KVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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