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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7ba65f337918731e4677d4b8fe8ceab0f0f5228b5be985cfc1708721aed59e4' 
  AND token = 'fTIiTvtFjxyaZ6bexfBCxn8SEFGEv26VghJAzEe4KjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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